package com.lbc.lock;

//  死锁：多个线程互相抱着对方需要的资源，然后形成僵持
public class DeadLock {

    public static void main(String[] args) {
        Makeup g1 = new Makeup(0, "灰姑凉");
        Makeup g2 = new Makeup(1, "白雪公主");

        g1.start();
        g2.start();
    }
}

//  口红
class Lipstick {
}
//  镜子
class Mirror {
}

class Makeup extends Thread {

    //  需要的资源只有一份，用static来保证只有一份
    static Lipstick lipstick = new Lipstick();
    static Mirror mirror = new Mirror();

    int choice;  //  选择
    String girName;  //  使用化妆品的人

    Makeup(int choice, String girName) {
        this.choice = choice;
        this.girName = girName;
    }

    @Override
    public void run() {
        //  化妆
        try {
            makeup2();
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }

    //  化妆，互相持有对方的锁，就是需要拿到对方的资源
    private void makeup() throws InterruptedException {
        if (choice == 0) {
            synchronized (lipstick) {  // 获得口红的锁
                System.out.println(this.girName+"获得口红的锁");
                Thread.sleep(1000);
                synchronized (mirror) {  //  一秒钟后想获得镜子
                    System.out.println(this.girName+"获得镜子的锁");
                }
            }
        } else {
            synchronized (mirror) {  // 获得镜子的锁
                System.out.println(this.girName+"获得镜子的锁");
                Thread.sleep(2000);
                synchronized (lipstick) {  //  两秒钟后想获得口红
                    System.out.println(this.girName+"获得口红的锁");
                }
            }
        }
    }

    //  来一个不死锁的
    private void makeup2() throws InterruptedException {
        if (choice == 0) {
            synchronized (lipstick) {  // 获得口红的锁
                System.out.println(this.girName+"获得口红的锁");
                Thread.sleep(1000);
            }
            synchronized (mirror) {  //  一秒钟后想获得镜子
                System.out.println(this.girName+"获得镜子的锁");
            }
        } else {
            synchronized (mirror) {  // 获得镜子的锁
                System.out.println(this.girName+"获得镜子的锁");
                Thread.sleep(2000);
            }
            synchronized (lipstick) {  //  两秒钟后想获得口红
                System.out.println(this.girName+"获得口红的锁");
            }
        }
    }
}